Cylindrical milling tool



1929- w. F. EMERSON CYLINDRICAL MILLING TOOL Filed Juqe 28, 1924 ATTORNEY Patented Dec. 17, 1 929 UITED STATES PATENT OFF-ICE WILLIAM FREDERICK EMERSON, OF WILLIAMSVILLE, NEW'YORK GYLINDRICAL MILLING TOOL Application filed June 28,

, means being desirably located at the upper portion of the tool and of such construction as to materially facilitate making the adjustment as required. My present improvements further embody special features of construction as related to the mounting of the tray members wherein the tray members in their adjusting movement are moved radially in unison while maintaining their proper angular relation and whereby in their innermost positions they will assume a nesting or overlying relation thereby providing a wider range of adjustment and desirable structural compactness. The present structure is further especially designed to incorporate therewith important features illustrated in my copending application Ser. No. 610,617 as related to the supporting arrangement for the hon'ihg stones whereby the latter are arranged to act under a yielding pressure while maintaining at all times parallelism of their acting surfaces. My present improvements further embody the desirable feature and structural arrangement wherein the honing stones are supported to be acted upon by an outwardly directed and yielding pressure and wherein the adjustment for size or. diam- 1 eter of the bore is accomplished without affecting the pressure means whereby the latter will be uniform in its action in the varied position and adjustment for size. A further and valuable feature of the improved structure consists in the normal manner of supporting the stones whereby they will have a tilted relation to the surface to be acted upon The device is of an improved design position.

1924. Serial No. 722,916.

with the result that'the cutting or honing action will be performed by the forward edge of the-stone whereby a material increase in effectiveness is obtained in addition to other important advantages.

The described and other features and advanta es of my invention will be understood by reference to the accompanying drawin wherein like reference characters are applie to the corresponding parts in the several views. v

Referring to the drawing:

Fig. 1 is a view in side elevationillustrating a desirable embodiment of the features of the present invention with the parts shown in their innermost position of adjustment.

Fig. 2 is a central, vertical, sectional view thereof with the Fig. 3 is a sectional plan view with the parts shown in the innermost position corresponding to Fig. 1 and taken on line 3-3 thereof.

Fig. 4 is asimilar view showing the parts in the position of adjustment corresponding to Fig. 2 wherein one of the tray members is shown in section.

In the approved construction as illustrated,

1 indicates a centrally positioned supporting shaft having its upper portion threaded'at 2 and formed with upper and lower integral and circular bearing collars 3 and 4. The bearing collars 3 and 4 are provided with concentrically arranged and equi-distantly spaced circular apertures 5 within which are fittedand supported bearing rods or shafts 66 arranged vertically and in parallel relation. Upon each of the'bearing shafts 6 there is pivotally mounted a carrier member or tray 7 of suitable-form and length to support the grinding or honing stones indicated at 8. As

shown the outer or body portions of the tray 7 are integrally formed with upper and lower arcuate arms 9 and 10 formed at their inner ends with apertured bearing collars 11 fitted to the shaft 6 whereby the trays are pivotally supported to swing about the bearing shaft parts shown in expanded fee shaft 1 and means are provided to efiect this adjusting movement operative to adjust the trays in unison and to constantly maintain the concentric relation of the several trays, four as shown, with respect to the shaft 1 or longitudinal axis of the tool.

In accordance with the present invention the means for effecting the circumferential or radial adjustment of the trays is arranged to be operable by simple manipulation from the upper ortion of the device with the result that t is adjustment may with facility be made at varied stages of the operation. The adjusting mechanism here shown comprises an adjusting member or disc member 14 of circular form having a knurled peripheralsurface 15 and a central bearing apershaft 1 an upon its lower surface it is formed to receiveequi-distantly spaced and concentrically arranged bearing studs 1616. The studs 16 provide pivotal bearings for connecting links 17 which are each pivotally supported upon the studs 16 at their, inner ends and at their outer ends have pivotal bearin upon screw studs 18 threaded to 'integral osses or extensions 20 of the respectivecarrier members or trays 7. In conseper cess1 quence of the symmetrical and concentric arrangement of the pivotal points 2, 16 and 18 and the corresponding angular positioning and length of the connecting links 17 ,the arrangement is such that upon the rotation of the adjusting member 14 relative to the supporting shaft 3, it will simultaneously'and uniformly swing the tray member 7 inwardl or outwardly to determine the effective (fiameter of the tool. The adjustment in unison as thus performed provides that in all positions of adjustment the supporting trays shall be equally spaced with relation to each other and also with relation to their radial distance from the central longitudinal axis of the tool or of the supporting shaft 1. As will be appreciated manipulation of the ad- 'usting member 14 allows of very quickly adjusting the effective diameter of the tool withm a wide range of movement and a wing clamping nut 22 is threaded upon the upper portion 2 of the supporting shaft and positioned to engage the adjusting member 14 to clamp the latter tightly against a shoulder 23 formed on the shaft 1 for rigidly securing the parts in adjusted position.

As will be noted, the adjusting lever 14 and the clamping nut 22, are arranged at the up- Eortron of the tool to be at all times acle to the operator so that the manipulation of the adjusted parts is conveniently and easily accomplished. U on the upper extremity of the supporting s aft 1, there is mounted a socket member 24 secured by the in 25, this socket being designed to eflect flexible coupling connection with the lower end of a driving spindle 27, which may, at

1 its upper end, be adapted for connection with the chuck ofa portable electric driving motor for rotatably connecting the lower end of the spindle 22 to the socket. The spindle is provided with a coupling pin 28 passed through an entry slot formed at the upper wall of the socket member and the socket is of a form to' provide shoulders 26 opposed to the end portions of the coupling pin 28 to efl'ect driving portions of the tray members assuming a posltlon inwardly of the rods thereby to obtain a maximum range of adjustment. The

arrangement whereby the supporting arms of the tray have a nesting or overlying relation is further instrumental in providing for the swinging movement of the trays in an arc of relatively large radius and from centers in close proximity to the axis of the supporting shaft 1 from which there is obtained the substantially radial to the central longitudinal axis of the tool and in consequence maintain elfectiveoperating relation to the wall to be acted upon.

With the improved construction as described there is desirably associated the special means for supporting the stone elements to be acted upon by an outward spring pressure in the manner covered by my co ending application Ser. No. 610,617, filed anuary 4, 192.3. The type of support as therein disclosed provides for supporting the stones to be ielding against the influence of anou-tward y acting spring pressure while at all times maintaining the accurate parallel re lation of the stones considered lengthwise thereby to insure that the finished bore shallbe of uniform diameter throughout its length. As a result the tool is operative to correct cylinder walls which have been worn to a tapered condition wherein the walls are in clined from parallel relation. .In the construction'as illustrated the central portion 30 of the rear Wall of the tray or carrier member is inwardly extended, providing an elongated socket 31 to receive a pressure transmission plate or tension plate 32 which is pivotally or hingedly supported lengthwise and at one edge thereof by having its longitudinal edge fitted within a hinge slot or recess 33 formed in the side wall of the tray member and extending lengthwise thereof parallel to the longitudinal axis of the tool.

desirable result that the trays throughout their length of movement maintain a position For retaining the plate 32 within the slot 33 the plate'is-provided with an enlarged aperture 35 to receive therein a securing screw stud 36 threaded to the inner or bottom wall of the tray. The slot 35 and screw 36 are proportioned to allow of the required movement of the pressure plate while retaining the plate within the hinge slot. The outer or free edge of the pressure plate 32 has hearing engagement upon the underside of the honing stone 8 indirectly by engagin the channel plate 37 in which the stone is tted. Within suitable socket depressions formedin the rearwal'l'of the trays, coil springs 38-38 are arranged in position interposed between the bottom of the tray and the inner sides of the pressure plates 32 so as to exert an outward pressure against the latter. As

best illustrated in Fig. 2 the end walls of the stones are provided with enlarged peck ets or recesses 39 engaging the retaining pin 40 and the retaining set screw 41 arranged to allow of the stones having a limited radial movement while retaining them within the trays,- It accordingly provides that the pressure plates 32 are supported and confined to move in a fixed plane under the influence of the compression springs bearing thereagainst and in consequence theradial movement of the honing stones is governed so as to be'uniform throughout their length and.

thereby maintain at all times the desired parallel or true vertical position of their active surfaces. This feature is of material importance as related to the successful operation of the tool in the reboring of .worn cylinders by insuring that the refinished bore shall have its walls accurately parallel or longitudinally of uniform diameter.

In accordance with a further feature of my invention the honing stones 8 are desirably sup orted within the carriers or trays 7 so as to e inclined or tilted with reference to the surface acted uponwith the result that the cutting or honing action is performed by the forward and outer longitudinal edge of the cutting stone. As a result thereof the pressure of the stone against the surface acted upon is concentrated and a more elfective cutting or honing action is obtained. Structurally, this is accomplished, as best illustrated in Figure 4, by the improved arrangement whereby the honing stones 8 are fitted within metal channel members 8 directly engaged by the tension plate 32 and proportioned to have a loose fit within the sockets of the tray members. To cooperate therewith the tension plates 32 are of such width as to engage theinside of the channel members 8 to one side of the central axis thereof to effeet the tilting of the stone to position it with one edge thereof outermost and to accordingly become the effective portion in the grind ing operation. Considered with relation to the direction of rotation of the tool, as indi cated'in Fi re 4, the tilting of the stone is such as to ring the forward edge thereof into outermost position and in practice this the described construction permits of conveniently adjusting the effective diameter of the tool to the size of the bore to be refinished. This-initial adjustment is effected by releasing the clamping nut 22 and rotating the manipulating member 14 thereby swinging the respective trays in unison to-determine the diameter of the tool or the radial. position of the trays "with relationto the bore after which the clamping nut is screwed down to rigidly clamp the parts in position. This adjustment is such that the stones shall be compressed or'moved inwardly againstthe influence of the spring actuated pressure plates 32 whereby the stones during the rotation of the tool within the bore shall act outwardly against the cylinderwalls under cidental to the improved structure, as disclosed, this initial adjustment of the stones with relation to the diameter of the bore to be acted upon is independent of and does not affect the pressure exerted by the springs 38 upon therespective stones.

Having described my invention I claim:

1. A device of the character described, comprising in combination, a supporting member, carrier members mounted upon the supporting member to be rotatable therewith and adjustable radially with relation thereto, said carrier members being formed with elongated sockets, abrading members secured within the sockets with provision for radial or outward movement, pressure plates hingedly supported longitudinally Within the carriers and positioned to engage the inner sides of the abrading members to one side of their central longitudinal axis, resilient means acting upon the pressure plates to impart yielding outward pressure to the abrading members and said abrading members being fitted loosely within the sockets whereby they are tilted or inclined with reference to the surface acted upon, substantially as described.

2. A device of the character described comtioned supporting shaft provided with spaced upper-and lower collars, bearing shafts sup ported by collars in parallel relation, carrier members having upper and lower sup orting arms pivotally mounted upon the caring shafts, means for adjusting the position of the respective carrier members in unison, said means consisting of a rotatable adjusting member having, a knurled peripheral surface and journalled upon the supporting shaft and pivotal link connections from said adjusting member to the respective carrier members, means for securing the adjusting member in its adjusted positions, said tray members being formed with elongated sockets, abrading members secured Within the sockets with provision for radial or outward movement, pressure plates hingedly supportedlongitudinally of the stones within the carriers and resilient means acting upon the pressure plates to impart a yielding outward pressure to the stones, said stones being of rectangular cross-section and having a loose fit within the sockets and said pressure plates being adapt- 25 ed to engage the inner surfaces of the stones adjacent one longitudinal edge thereof whereby the stones will he tilted with reference to the surface acted upon. Signed at Buffalo. in the countv of Erie 30 and State of New York this 26th day of April A. D. 1924.

\VILLIAM FREDERICK EMERSON. 

